Piston-packing



D. W. JEWELL. PISTON PACKING.

(ModeL) mvmmn:

ATTORNBYQ WITNESSES:

UNITED STATES PATENT OFFICE.

DELBERT W. JEVVELL, OF ALEXANDER, NEW YORK.

PISTON-PACKlNG.

SPECIFICATION forming part of Letters Patent No. 271,076, dated January23, 1883,

Application filed November 22, 1882. (ModeL) To all whom it may concernBeit known that I, DELBERT W. J EWELL, of Alexander, in the county ofGenesee and State of New York, have invented a new and usefulImprovement in Piston -Packings, of which the following is a full,clear, and exact description.

The object of my invention is to provide for the adjustment of thepackings of pistons from the outside and without removing either head ofthe cylinder.

To that end the invention consists in packing-segments fitted to slideradially of the piston-head and in cams carried by a sleeve on thepiston-rod for forcing the segments outward, as specially set forth andclaimed hereinafter.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a perspective view of a piston head and rod with a portionof the head broken away to show the packing-segments. Fig. 2 is across-section of the piston-head. Fig. 3 is a perspective view of onesegment detached, and Figs. 4 and 5 are similar views of another form ofsegment and packing.

The piston consists of two circular disks, A A, formed. with radialgrooves a, and attached a short distance apart on the rod B, so as toreceive the packing-segmentsG between them. The segments, which are fourin number, preferably are formed with ribs b, which take into thegrooves a, so that the segments are guided in their movements. On theirouter edges are packing strips or segments cl, pivoted at theirmid-length by lugs c, and rabbeted at their ends to lap one uponanother, so as to form a continuous packing at all times.

Upon the rod B is a loose sleeve,D,extending through the inner disk Aof"the piston, and formed or provided on its end between the two diskswith a series of cams or eccentrics,

f, against which the lower ends of the segments 0 abut. The sleeve isheld from turning by a nut, g,-on the rod, which,on being loosened,allows the sleeve to be turned, and the segments thus forced out by thecams. The packing-strips d accommodate themselves to the inner surfaceof the cylinder, and to further insure a tight packing two or more ofthe segments may be made, as shown in Figs. 1 and 3, with slide-blockhat their inner ends taking upon springs t, fitted in the segments. Thisconstruction allows each segment to move out to the extent required.

When the packings are fitted to a piston they can be readily adjustedwithout removing the heads of the cylinder with which the piston isused. All that is necessaryis toloosen nutg and turn the sleeve D by theapplication of a wrench to the portion of the sleeve projecting outsidethe cylinder.

Having thus fully described my invention,

I claim as new and desire to secure by Letters Patent- 1J'Thecombination, with a piston head and rod, of sliding segments 0 andsleeve D, carrying cams or eccentrics substantially as shown anddescribed. 7

2. The packingsegments 0, camsf, and sleeve D, in combination with thedisks A of a piston head and rod, B, substantially as de-- scribed, foroperation as specified.

3. In piston-packings, the rocking strips d, combined with the movablesegments 0 of the piston-head, substantially as shown and dc DELBERTWALTER JEWELL.

Witnesses:

E. G. MoULToN, EDITH A. MoULToN.

